Trimming machine



8- 1942- I s c. a. BROSTROM 2,292,50

- THINKING MACHINE Filed Jan. 17, 1940 5 sheets-sheet 1 Aug. 11, 1942.

- G. BROSTROM mmu'ne mourns Y Filed Jan; 17, 1940 5 Sheets-Sheet 2 //v VEN TUE";

5 Sheets-Sheet Aug. 11, 19422.

C. G. BROSTROM TRIMMING MACHINE Filed Jan. 17, 1940 Aug; 11,- 1942. n. a. .BROSTROM 2, 5

- mnmme' means I Filed 17, "1940 5 Sheets-Sheet 4 //v VE/V TURL (4M1 43% Aug. 11,1942. c, BRQSTRQM I "2,292,508

TRIMMING MACHINE Filed Jan. 17, 1940 5 Sheets-Sheet 5 vfA/m/a UL V76 KMdM I Patented Aug. 11, 1942 TRIMMING MACHINE Charles G. Brostrom, .Salem, Masa, assignor to United Shoe Machinery Corporation, Borough of Fleming'ton, N. J., a corporation of New Jersey Application January 17, 1940, Serial No. 314,257

16 Claims.

This invention relates to trimming machines and is herein illustrated as embodied in a machine designed to trim the inseams of welted shoes. One of the novel features of the invention is embodied in an improved type of rotary cutter-head the cutting effect of which is smooth and desirable for the operation specified above.

Present-day requirements of inseam-trimming are exacting with respect to smoothness, uniformity, and closeness to the inseam stitches. Many shoe manufacturers demand an inseamtrimming machine that will sever the surplus inseamed materials almost but not quite .to the stitch-line. Some of them are dissatisfied if these materials project a; of an inch beyond the outer stitch-line at any point. It is possible, of course, to trim within the range mentioned, but when this is done with inseam-trimming machines of the types heretofore available for this operation, the problem is aggravated by the risk of trimming to or actually into some of the stitches at certain points because the irregularities in the configuration of an inseam require swinging the ends of a shoe laterally, and these motions must be compounded with various rocking motions required to counteract the various surface irregularities of a shoe bottom. These compounded swinging and rocking motions are most troublesome while traversing those portions of an inseam that extend along the hump in the the line of trimming too far from the stitch-line at other portions of the shoe.

In view of these conditions, an object of the present invention is to provide an improved type of cutter-head that will not only insure smooth, even trimming but will also avoid obstructin the necessary rocking motions, including those of greatest amplitude, required by womens highhaving a circular'peripheral cuttingedge. The

region of the ball-line and the incurves extending therefrom into the shank. The conditions are especially difiicult also at the toe-end where the.

thickness of the inseam is greatest because of the presence of a toe-stiffener and the pleats formed in that region incidentally to toe-lasting.

The type of inseam-trimming machine most commonly used is illustrated and described in United States Letters Patent No. 1,226,872, granted May 22, 1917,, on application of A. Eppler. In a machine of that type the trimming cutter is cup-shaped, its axial dimension being about three inches and the diameter of its annular cutting edge being about four and one half inches. This type of cutter performs a satisfactory trimming operation on shanks intended for low heels, but when used to operate on women's high-arch shoes that require the maximum rocking motion while traversing the shank and the region of the ball-line, the butt-end of the cutter frequently prevents rocking the shoe as much as the conditions require, with the result that the trimming is forced to deviate too far from the intended line and may cut into the stitches unless adjustments are made individual rotatability of the cutters provides for' utilizing all the segments of each cutting edge equally, and, although only a short segment of each cutting edge is effective at any one time,

the wear and the dulling eflect of use are equally distributed along the edge. The skewed relation of the individual cutter axes to the axis of rotation of the cutter-head develops a force that tends to turn each cutter about its individual axis in consequence of encountering the work and this force alone would be sufficient to bring successive portions of the cutting edges into operation automatically, but the invention also .ing operation when the abrading wheel is presented to'the cutters.

In the drawings,

Fig. 1 is a front elevation of the head of a machine embodying the improved features and principles of the present invention;

Fig. 2 is a plan view of the machine;

Fig. 3 is a sectional view of the cutter head, the driving meanstherefor, and the grinder ,for sharpening the edges of the cutters;

Fig. 4 is 'a view illustrating the gearing carthat keep ried by the cutter-head for driving the cutters;

shown in Fig. 8 and including other elements, one

of which is the means for operating the feed wheel; and

Fig. 10 is a detail view of a portion of the mechanism for varying the speed of rotation of the cutters about their own axes.

The supporting frame of the machine is represented by the reference character I in Fig. 1, this frame being mounted on any suitable base. The frame I0 extends upwardly and rearwardly of the machine and the rearward portion thereof is formed as a bearing I2 (Fig. 2), having a cylindrical bore I4 therethrough. A sleeve or bushing I8 is carried by the bore in the bearing I2 and forms a journal for a drive shaft I8.- A cutterhead supporting arm 20 is mounted on extended portions 22 of the sleeve I0 by means of spaced bearings 24 and 26 formed adjacent to the rearward end of the arm 20. The forward end of the arm 20 carries a cutter-head to be presently described and is arranged for vertical adjustment. To adjust the vertical position of the forward end of the arm 20, an adjusting screw 28 is threaded-' 1y carried by the arm 20 adjacent to its forward end, this screw being provided with a hand wheel 30 for facilitating adjustment thereof. The lower end of the screw 20 passes through the arm 20 and bears against a portion of the supporting frame I0, this screw 28 thus acting as an adjustable support for maintaining the forward end of the arm 20 at a desired heightwise position with respect to the frame of the machine. In order further to support the forward end of the arm 20, an adjustable brace 32 (Fig. 1) is provided. The lower end of the brace 32 is substantially spherical and is held against the frame of the machine by means of a bracket 34 secured by means of a screw 36 to the frame of the machine. The upper end of the bracket 34 has a socket portion for receiving the lower end of the brace 32 and a similar socket is formed in the vertical wall of the frame I0. The upper endof the brace 32 is similarly formed and is secured by means of a bracket 38-(Fig. 2) to the supporting arm 20.

The brace is formed with a telescopic portion 40 (Fig. 1) by means of which the length of the brace may be varied in accordance with the adjusted position of the forward end of the supporting arm and a set screw 42 is provided for preventing contraction of the brace after the arm has been adjusted to its proper vertical position. The spherical ends of the brace permit relative movement of the brace with respect to the frame and arm as the armis rocked about the sleeve I 6.

The forward end of the. arm 20 has secured thereto by means of the screws 44 a cutter-head supporting block 46. This block i formed with a dovetail groove 48 (Fig. 1) for siidably receiving the cutter-head supporting bracket 50. An adiusting screw 52 (Figs. 1 and 3) is threaded into the right end of the bracket 50 and is maintained against lengthwise movement with respect to the supporting block 40 by means of an arm 54 secured to the right end of the block and having a recess 50 through which the screw passes. The screw has a head 50 engaging one side of the plate 54, and a collar 00 fixedly secured to the screw engages the other side of the plate. Rotation of the screw 02 by means of the head II will cause lengthwise adjustment of th brac 50 with respect to the supporting block 40. Indicia 62 (Fig. 1) may be provided on the front of the block and the bracket to indicate the degree of adjustment.

The bracket 50 (Fig. 3) has a pair of depending arms 62 and 64 having alined apertures in which are received ball bearings 66 and 88 respectively. Supported by these ball bearings is a cylindrical extension of a cutter head I2, this extension I0 passing outwardly beyond the ball bearing 00 and being threaded to receive a nut I4. The left end of the extension I0 adjacent to the head I2 is enlarged at It and this enlarged portion is maintained against the inner race of the ball bearing 06 by means of the nut 14. A sleeve I0 surrounds the cylindrical extension I0 of the cutter-head I2 between the bearings 00 and 00 and forms a spacer member for preventing movement of the bearing 60 toward the bearing 00 upon tightening of the nut I4. A pulley 00 is mounted on the sleeve I8 and is fixed to the cylindrical extension I0 by means of a set screw 02. A washer 84 i provided between the bearing 66 and the cutter head I2 to prevent the entrance of foreign material from the cutter-head into the bearing.

Rotatably mounted in the cylindrical extension I0 and the cutter-head I2 and concentric with the extension I0 is a drive shaft carrying at its extreme right end a drive pulley 00 secured thereto by means of a set screw 00. The shaft 00 is somewhat smaller than the bore through the extension I0 and a bushing 82 is fitted into the right end of the extension I0 to form a bearing surface for the right end of the shaft 00. The opposite end of the shaft 80 is journaled in the head I2 so that the shaft 00 may be rotated with respect to the head if the pulleys 00 and 00 are rotated at different speeds.

The cutter-head I2 is generally square in cross section with the outer edges thereof beveled ofl to-form bearing surfaces for the inner sides of cutters 96 and 90. The head I2 has a cylindrical bore I00 extending therethrough for housing gearing for transmitting motion from the shaft 85 to the cutters. The shaft 06 can'ies a skew gear l02 -(Fig. 4), this gear being located in the vertical passageway in the head I2. The gear I02 engages skew gears I04 and I00 located on opposite sides of the gear I02 in the aper ture I 00 of the head I2. The axes of the gears I04 and I00 are arranged at right angles to each other and are skewed with respect to the, drive shaft 80. The skew gears I04 and I00 are pinned to shafts I08 and H0 respectively, these shafts being-joumaled in the head I2 by means of bushings 2 (Fig. 3). The shafts I00 and H0 are threaded at their outer ends for receiving nuts II4 having frusto-conical exterior surfaces for engaging similarly shaped openings in the cutters to maintain these cutters against collars IIO formed adjacent ,to the outer ends of the shafts. The opposite ends of the shafts are squared as at IIO for receiving a wrench to prevent rotation of the shafts while the nuts II4 are being tightened. In assembling the shafts and gears in the head I2, the bushings for supporting the shafts are first inserted by means of the aperture through the central part of the head. A gear is then held in alinement with the bushings and the appropriate shaft is then inserted through the gear and the bushings. pin I20 is then inserted through a collar I2I integral with the gear and through the shaft to prevent. relative movement between the shaft and gear. Each gear has reduced collar portions at each side thereof, as indicated in Fig. 4, these collar portions engaging the ends of the bushings II2 to prevent axial movement of the gear and consequently of the cutter supporting shaft which is pinned thereto. It should now be understood that rotation'of the shaft 86 relative to the cutter-head 12 will cause rotation of the cutters 86 and 88 about their own axes, the speed of rotation depending upon the difference in the relative speeds between the shaft and the cutterhead. If the cutter-head is rotated at a speed which is the same as the speed of the shaft 86. and in the same direction, there will be no relative movement between the drive gear I02 in the cutter-head and the ears I04 and I06 and consequently there will be no rotation of the cutters about their own axes.

The shaft I8 (Fig. 2) carries a driving pulley I20 which is connected to the pulley 80 by means of the belt I22. The shaft I8 carries a second pulley I24 connected to the pulley 88 by means of a belt I26. The diameter of the pulley I24 is somewhat less than the diameter of the pulley I20, whereas the pulleys 80 and 88 are of the same diameters. If there is no substantial slippage between the belts and the-respective pulleys, the speed of rotation of the driven pulley 88 will be somewhat less than that of the driven pulley 80. If, however, the belt I26 connecting the pulleys 88 and I24 be removed or be loosened to such an extent that it does not transmit any motion from the pulley I24 to the pulley I28, the shaft 86 will tend to rotate at the same speed as the cutter head 12 because of the drag thereon imposed by the skew gears in the cutter-head. Thus, if the'belt I26 is sumciently loose, there will be no relative movement between the shaft 86 and the cutter-head and, accordingly, there will be no movement of the cutters about their own axes unless some external force acts upon the cutters and exerts a drag upon them during the rotation of the head 12, which may occur .whenever the cutters are engaging work to be trimmed. If the belt I26 is gradually tightened from the loose condition which has just been presumed to exist, the speed of rotation of the shaft 86 will gradually decrease to a speed corresponding to the diameter of the pulley I24 and, accordingly, as the tenextensions of the bearings 24 and 26 respectively. A third arm I46 supports the endof the arm I40 adjacent to the pulley I24, the forward end of the arm I46 being joumaled to the shaft I8 as indicated in Fig. 7. An arm I50 is pinned to the shaft I84 and the other end of this arm is pivoted to a member I54 (Fig. 10) which embraces a reduced portion of a screw I56 threaded into a boss I51 extending laterally from the, arm I44. A hand wheel I58 is connected to the upper end of the screw I56 for facilitating the turning of the screw and for adjusting the position of the arm I50 which, in turn, adjusts the shaft I34. As the shaft I34 is turned, the vertical position of the idler pulley I30 is varied to adjust the tension on the belt I26. In this manner, the speed of rotation of the cutters about their own axes may be readily varied.

In order to feed the work past the cutters, the feed wheel I62 (Figs. 1, 6, 8, and 9) is provided. This feed wheel is frusto-conical in shape and the upper surface thereof is concave or dished in order to permit passage of the cutters there-' over. The edge of :the feed wheel is sharp and forms a shearing edge and the cutters approach this edgeat an angle to the radius of the wheel so as to give a. shearing cut to the work. The

under surface of the feed wheel is roughened or ribbed as indicated in Fig.- 6 so as to grip the welt of the shoe which is pressed thereagainst by means of a. presser foot I64 which enters the crease between the welt and the upper (Fig. 9). The feed wheel I62 is mounted on a shaft I66 mounted in an arm I68 rigid with the frame I0 of the machine and extending upwardly and forwardly thereof. This shaft is mounted at an angle to the vertical so that the feed wheel will feed the work in a substantially horizontal plane. The lowerend of the shaft I66 carries a bevel gear I10 which engages a second bevel gear I12 mounted on a shaft I14 extending toward the rear of the machine (Fig. 9).. The rear end of the shaft I14 carries a sprocket wheel I16 over which passes a sprocket chain I18 connected to a suitable driving means. The feed wheel is rotated slowly to move'the work slowly past the cutters which are being revolved about the axis of the cutter-head 12 at a relatively high speed to impart a shearing cut to the inseam I which is upstanding, as shown in Fig. 9.

A pressure arm I80 engages the lower side of the presser foot I64 to urge the presser foot against the welt with a predetermined pressure.

' In' order to reduce the frictional drag between sion on the belt is increased, the speed of the moval from the belt by means of the guards I84 on each side of the pulley. The arm I82 is pinned to a shaft I34 extending transversely of the machine at the rear thereof. .The shaft I84 is journaled in bearings I36 and I38 carried by an arm I40 extending transversely of the machine below the shaft I34. The arm I40 is connected to the cutter-head supporting arm 20 by means of the arms I42 and I44 which are formed as the presser foot I64 and the welt, the presser foot is arranged to be reciprocated rapidly during the feeding movement of the work. The presser foot reciprocates relatively to the pressure arm I and in order to reduce friction between these two parts a small steel ball I (Figs. 1

and 6) is mounted in the end of the pressure arm and forms the contact surface between the arm and the presser foot I64. The rearward end of the presser foot I64 is secured to an arm I8I which is, in turn, pivoted to a stub shaft I82 by means of spaced bearing members I83 for movement in -a vertical plane. The stub shaft I82 is fixedly secured in the forward end of an arm I84 lying between the bearing members I82 by means of a set screw I86 and the arm' I84 is mounted on a shaft I00 for movement in a horizontal plane. The shaft I90 is rotatably mounted in a bearing I92 fixed to the side of the arm I68 and'a collar I84 is fixed to the shaft "I90 below the bearing I82 to prevent endwise move- 'by means of a screw 282 4 ment of the shaft. An L-shaped arm I86 is fixed by means of a set screw I88 to the rearward end of the arm I84 and the other end of.

the L-shaped arm l66'carries a cam follower 200 which rides in the peripheral cam groove of a cam 202 fixed ,to the left end of the shaft I8. Accordingly, as the shaft l8 rotates to drive the cutter-head and the cutters, the presser foot I64 will be reciprocated by means of the cam 208 about the axis of the shaft I90 so as to reduce the frictional drag between the presser foot I64 and the welt W of the shoe, the inseam of which is being trimmed.

The pressure arm presser foot I64 against the welt of the shoe is mounted for horizontal adjustment on a slide 206 by means of screws 206, the slide being provided with slots 2l0 (Fig. 9) to permit horizontal ad- Justment of the arm I80 with respect thereto. The slide 206 is provided with vertically extending dovetailed grooves which fit over dovetailed slides 2l0 (Fig. 1) mounted on the frame of the machine. A tension spring 2I2 is connected by means of a pin 2 to the lower end of the slide 206 and the upper end of this spring is connected by means of a screw 2I6 to the frame of the machine. The spring, accordingly, urges the slide upwardly so that the arm I80 exerts an upward force on the presser foot I64 to press the welt of the shoe against the feed wheel. An adjustable stop is provided by a screw 220 (Fig. l) for limiting the upward movement of the slide 206. This screw is threaded through a tapped lug 222 on the frame of the machine and the screw is provided with a lock nut to hold it in adjusted position.

The slide 206 is provided with an apertured boss 224 at its lower end for receiving the angular extension of a treadle rod 226, the lower end of which is connected to a treadle (not shown) whereby the slide 206 may be moved downwardly by the operator against the force of the spring 2I2. A second tension spring 230 is connected at its lower end to the left side of the slide 208 and the upper end of this spring is connected by means of a screw 234 to the presser foot I64. This spring maintains the presser foot in engagement with the ball I65 carried by the arm I80 so that as the arm I80 is moved downwardly by the operator, the presser foot I64 will follow the downward movement and will move away from the lower surface of the feed wheel I62 to facilitate the insertion of a welt between the feed wheel and the presser foot.

I80 which maintains the lower end of this cover plate 264 by means of a screw 264 and this spring acts to urge the channel guide downwardly and toward the feed whe l I82 to maintain the inseam of the shoe against the periphery ofthe feed wheel.

In order to facilitate placing 'of the work in position to be trimmed, it is desirable to move the channel guide outwardly away from the feed wheel when the presser foot I64 is moved downwardly therefrom. For this purpose, a connection is provided between the slide 266 carrying the presser arm I60 and a rearward extension 210 of the arm 242. The rear part of the extension 210 carries a hook member 212, the upper end of which passes through the extension 216 and is threaded to receive a nut 214. A connection such as a chain 216 connects the hook 212 with the slide 206, the slide being provided with a plate 286 which is apertured at its upper end to receive the lower end of the chain as shown in Fig. l. The chain 216 passes downwardly and rearwardly of the cover member 264 which partially surrounds the cutter-head 12. As the slide 206 is moved downwardly by the operator, the chain 216 will also be moved downwardly and will rock the mm 242 carrying the channel guide in a counterclockwise direction, as viewed in Fig. l, to move the channel guide upwardly away from the feed wheel I62. After the welt of the shoe, the inseam of which is to be trimmed, is placed between the feed wheel and the presser foot I64, the treadle is released by the operator whereupon the spring 2I2 moves the slide 266 upwardly .and causes the arm I80 carried thereby to move the presser foot I64 upwardly to maintain the welt of the shoe in firm engagement with the lower surface of the feed wheel. At the same time, the spring 260 rocks the arm 242 back to the position illustrated in Fig. l, whereupon the channel guide enters the channel, forcing the inseam of the shoe against the periphery of the feed wheel I62 and maintaining it in this position during the trimming operation. An adjustable screw 218 threaded through the arm 242 and engaging the cover plate member 264, limits the movement of the channel guide 240 toward the feed wheel I62.

A cover 260 completes the protective casing around the cutter-head, this cover being pivoted at 262 to a laterally extending end of the cover plate 264 (Fig. 2). A screw 284 passes through the forward end of the cover 280 and In order to maintain the inseam against the edge of the feed wheel I62 a channel guide 246 (Fig. 6) is provided,'this guide having a lower end'arranged to enter the channel formed by the upstanding rib on the bottom of'the insole. The channel guide is connected for vertical adjustment on the lower end of an arm 242 by means of a screw 244 (Figs. 1 and 2), the arm 242 having a vertically extending slot 246 to permit of this adjustment. The arm 242 extends upwardly and re'arwardly of the machine. and at its upper end is secured to a shaft 248 by means of set screws 260. The shaft 248 is journaledin brackets 262 which embrace the arm 242, these brackets being integral with a cover plate 264 that extends partially around the cutter head I2 and forms an extension of the cutter-head supporting bracket as indicated in Fig. 3. A spring 260 (Figs. 1 and 2) is connected at its upper end to the channel guide into the cover plate 264 to lock the cover in closed position. A grinder is rotatably carried by this cover and is adjustably mounted thereon for movement toward and away from the cutters 88 and 86 and enables sharpening of these cutters when necessary without stopping the machine or removing the cutters from the cutter-head.

The cover 280 has a circular opening there- 1 through and adjacent to one side of the circular opening the cover is provided with a pair of spaced lugs 286, the adjacent sides of which are slotted as at 281 in Fig. 5 to form between them a dovetailed groove. Slidably supported by the lugs 286 is asupport 286 for a grinder 288. The support 286 carries a shaft 286 at its rearward end, the shaft being fixedly mounted in the support 286 by means of a set screw 292. Inwardly of the support 286 the shaft 286 is reduced as at 284 (Fig. 3) and a ball bearing 286 is mounted on the shaft against the shoulder formed between the enlarged and reduced portions of the shaft. A pulley 860, is mounted-on the ball bearspring is connected to the in the desired horizontal position.

of a screw 364. The inner surface of the pulley adjacent to the flange portion is threaded for the reception of the screw 364 and this screw is hollow and surrounds the shaft 264. The inner end of the shaft 234 is further reduced and a ball bearing 366 is mounted on this inner portion" ofthe shaft and supports the screw 304 adjacent to the head thereof. A nut 333 is threaded on the inner portion of the shaft 264 and maintains the bearing 306 against a shoulder 3Ill. A belt 3I2 connects the pulley 300 with a pulley 3 on the drive shaft I3.

The grinder is arranged to grind both of the cutters 91 and '36 during the rotation of the cutter head I2, as indicated in Fig. 3, and the grind er may be adjusted toward or away from the cutters to obtain the proper grinding action and moved away from the cutters after they have been properly sharpened. A screw 3I6 is threaded through a wall 3| 8 extending laterally from the cover 260. The screw is provided with a pair of collars 322 rigid therewith, these collars engaging opposite sides of the'support 236, which support is recessed and reduced at this point as shown in Fig. 5. Rotation of the screw 3I6 causes movement of the support 286 toward or away from the cutters 96 and 98 and, therefore, the grinder is readily adjusted with respect to the cutters.

The driving shaft I8 is provided with a pulley 326 (Fig. 2) which is connected to any suitable driving means by a belt 328 for causing rotation for conducting the trimmed material to a suitable point of disposal, the conduit 332 being connected, if desired, to asource of suction. In order thot the mouth of the conduit 332 register properly with the cylindrical extension 330, it

. individual axes, a different surface of each cutter will be presented to the material being trimmed at each rotation of the cutter-head, thus prolonging the cutting surfaces of the cutters so that infrequent sharpening thereof ,will be required.

After the machine has been properly adjusted,

and it is obvious that such adjustments will be made at infrequentintervals only, the machine is ready for use. In presenting the work to the machine, the operator steps on the treadle which moves'the slide 266 downwardly against-the force of the spring 2I2 and this downward movement of the slide causes a similar movement of the presser foot I64 so that the presser foot may be the channel guide enters the channel formed being understood that this extension moves with the cutter-head assemblyduring adjustment thereof, the conduit 332 is mounted for vertical and horizontal adjustments. The conduit 332 is mounted on a slide 334 (Fig. 1) which is, in

turn, mounted for horizontal adjustment on a support 336. A screw 338 holds the support 336 The support 336 is bolted to the frame of the machine by means of a screw 34!! and the support 336 has a vertical slot 342 for permitting vertical adjustment of the support relative to the frame of the machine. a

In the use of the machine, the cutter-head support 46 will be adjusted vertically by means of the hand wheel 30 and the position of the cutter-head laterally and vertically of the feed wheel may be adjusted by means of the screw 52. When the cutter-head is properly adjusted, the cutter will pass over the forward edge of the feed wheel very close thereto so as to trim the material. with a shearing cut. The tension of the belt I26 may during the formation of the rib and urges the rib and the inseam materials toward the feed wheel so that the shoe is maintained in proper position with respect thereto. The work is fed by the feed wheel during which time the cutter-head r0.- tates rapidly so that the inseam is trimmed throughout the entire extentof the welt. The cutters offer no obstruction to any rocking motion of the shoe that may be required such as when traversing those portions of the inseam that extend along the hump in the region of the ball-line and the incurves extending therefrom into the shank, so that the cutters may cut the inseam close to the line of stitching at all points. The cutters perform a shearing cut in the inseam due to the fact that the cutters approach the feed wheel at an angle to the radius thereof and, accordingly, the inseam is trimmed with a smooth out throughout the extent thereof. While two cutters have been illustrated as being carried by the cutter head I2 it is to be understood that the machine would operate satisfactorily'with only a single cutter or, if desired, more than two cutters could be employed. While the cutters in the i1- lustrated machine are positively rotated about their own axes, this positive drive might be dispensed with since the cutters approach the feed wheel at such an angle that a turning force is imparted thereto upon contact with the work being trimmed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In a trimming machine, a cutting disk having a circular cutting edge, a carrier by which said disk is moved in an endless path, means for,driving said carrier, a work engaging memher having a shearing edge transverse to said path and across which said cutting disk is moved .by said cairier in shearing relation thereto, and means for rotating said cutting disk about an axis concentric with its cutting edge.

.2. In a trimming machine, a cutter head, means for rotating said cutter head about an axis, a cutting disk having a circular cutting edge, said disk being carried bodily by said cutter.

head in an orbital path about said axis, means for rotating said cutting disk about an individual axis concentric with its cutting edge, and" a work-engaging member having a shearing edge transverse to said orbital path and across which means for rotating said said cutfl s diskis moved by said cutter head in shearing relation thereto.

a trimming machine, a cutter head roaboutanaxis,acuttingdiskcarriedbodsaid cutter headin an orbital path. said disk being.

relation-to thefirstaxisandhaving a edge concentric with said indiark-engaging member having a shearing edge to said orbital path and across hich said cutter is moved by said cutter head in shearing relation thereto, means ior rotating said cutter head, and means for simultaneously rotating said cutting disk about its individual axis.

4. In a trimming machine, a rotatable cutter head, means ior driving said cutter head, a cutting disk having a circular cutting edge, said disk being carried by said cutter head for bodily movement in an orbital path about the axis rotation oi! said cutter head, a work-engaging member having a shearing edge transverse to said path and across which said cutter is moved by said cutter head in shearing relation thereto.

cutting disk about an axis ofiset from said cutter head. and means for holding a work piece against said work-engagmember with the portion to be trimmed shearing edge.

B. In a trimming machine, a series or individual rotatable cutters-each having a peri heral cutting edge concentric to its axis oi rotation, a member tor bracing work to be trimmed against the action oisaid cutters, said member having a sharp edge, means for bodily moving said outtars one aiter another in shearing relation to said sharp edge, and means for simultaneously rotating said cutters about their individual axes.

6. In a trimming machine, a rotatable cutter head, acutting disk carried bodily by said cutter head inan orbital path about the axis 01 rotation or said cutter head and for individual rotation about its own axis, means for rotating said cutter head about its axis of rotation and ior simultaneously rotating said cutting disk about its axis, and a feed wheel having a circular peripheral work-engaging edge the work-engaging segment or which is transverse to the path of movement or said cutting disk and across which said cutting disk is moved in shearing relation.

'1. In a trimming machine, a ieed wheel having peripheral edge, a rotatable cutter having a circular peripheral cutting edge concentric to the axis thereof, means for holding a work piece against said reed wheel with the portion of the work piece which is to be trimmed against said edge, means for continuously moving said cutter, bodily in a closed path in which it moves rapidly past said teed wheel in shearing relation to the edge thereof. and means for simultaneously rotating said cutter about its own axis.

8. An inseam trimmer comprising a circular iced wheel having a sharp peripheral edge, means tor rotating said reed wheel, a rotatable cutter having a circular peripheral cutting edge concentric to the axis thereof, a presserflnger tor holding' the welt of a shoe against said feed wheel with the inseam portion to be trimmed against said peripheral cutting edge. means for tableaboutanindividualaxisin aaaaeos means for feeding a work piece, saidmeans comprising a rotatable teed wheel having a roughened surface for engaging thework piece to be led, a presser finger for maintaining the work piece to be red continuously against the roughened surface of said teed wheel, means for continuously rotating said teed wheel, and means for .rapidly reciprocating said presser finger in the line of movement at the work piece.

10. In a trimming machine, a cutter-head having an axis oi rotation and power-driven means for operating it, a trimming cutter carried by said cutter-head and having an individual axis of rotation movable around the axis first mentioned, an abrading member arranged to generate an acute cutting edge on said cutter in consequence oi' rotating said cutter-head about its said axis, a work-en aging member having an edge in shearing relation to said cutter. and power-driven means arranged to rotate said cutter about its individual axis while the cutterhead is in rotation to present diilcrent segments of the cutter in successive revolutions of the cutter-head to the work or to said abrading member or to both, as the case may be,

11. In a trimming machine, a rotatably mounted cutter-head, a cutter carried thereby for retation about an axis oilset from the axis 01 said cutter-head and skewed relatively thereto, said cutter having a circular peripheral edge concentric to said oilset axis; means'ror rotating said cutter-head to cause, said cutter to travel in a circular path concentric to the axis of said cutter-head, and means synchronized with said last named means for simultaneously rotating said cutter about its own axis at a relatively slow speed compared to the speed of rotation of said cutter-head.

reciprocating said presser finger in the line of 12. In a trimming machine, a rotatably mounted cutter-head, a cutter carried thereby for retation about an axis oflset relative to the axis oi! said cutter-head and skewed relatively thereto,

said cutter having a circular peripheral edge concentric to said ofiset axis, acircular work feeding member arranged to brace work to be trimmed against the action or saidcutter and having a sharp edge in shearing relation to the peripheral edge of said cutter, means for rotating said cutter-head relative to said work feeding member to cause said cutter to travel in a circular path concentric to the axis or said cutter-head and to move past the feeding member in shearing relation thereto, and means for rotating said work fieding member to feed the work past said out- 13. In a trimming machine, a rotatably mounted cutter-head,'a pair 01 cutters carried thereby for rotation about axes on opposite sides or the axis or said cutter-head and skewed'relatlvely and oppositely thereto, said axes being so disposed that said cutters will follow one another in a circular path concentrieto the axis of said cutter-head upon rotation oivsaid cutter-head, means for rotating said cutter-head, and means for rotating said cutters at equal speeds and at a speed slower than the speed of rotation 01 said cutter-head during their movement in a circular path by said cutter-head.

14. Ina trimming machine, a rotatably mounted cutter-head, a cutter carried thereby for rotation about an axis oflset relative to the axis of said cutter-head and skewed relatively thereto,

said cutter having a circular peripheral edge.

concentric to said ofl'set axis, a transmission shalt shoe parts, in said head and rotatable'with respect thereto to cause said cutter totravel in a circular path concentric to the axis of said cutter-head, and

means for simultaneously rotating said trans-" mission shaft at a speed somewhat slower than the speed of rotation of said cutter-head to cause said cutter to rotate slowly about its own axis.

about the axis of said head and connected to 15. Ina trimming machine, a rotatably mounted cutter-head, a pair of cutters carried thereby for rotation about axes disposed on opposite sides of the axis of rotation of said cutter-head, a transmission shaft carried by said cutter-head between the axes of said cutters, said shaft being rotatable with respect to said cutter headv and operatively connected to said cutters, means for rotating said cutter-head to cause said cutters to follow one another in a circular path concentric to the axis of said cutter-head, and means for rotating said transmission shaft at a speed somewhat less than the speed of rotation of said cutter-head to cause rotation of said cutters about their own axes at a slow speed.

16. In a trimming machine, a rotatably mounted cutter-head, a pair of cutters carried thereby for rotation about axes disposed on opposite sides of the axis of rotation of said cutter-head, a transmission shaft carried by said cutter-head between the axes of said cutters, said shaft being rotatable with respect to said cutter-head and operatively connected to said cutters, means for rotating said cutter-head to cause said cutters to follow one another in a circular path concentric to the axis of said cutter-head, means for rotating said transmission shaft at a speed somewhat less than the speed of rotation of said outter-head to cause rotation of said cutters about their own axes at a slow speed, and means for adjusting the speed of said transmission shaft to vary the speed of rotation of said cutters about their own axes without affecting the speed of rotation of said cutter-head.

CHARLES G. BROSTROM. 

